Originally Posted by Justice06RR
(update) I took the lower apart and saw that the spring was not catching the trigger pin correctly. I adjusted the pin/spring and This seemed to have remedied the issue. Thanks for the advice. I will skip the KNS pins if I don't have any further issue.
Glad it's fixed. I encountered this the first time I took a FCG out, very easy to do. KNS pins do serve a purpose. They stop the hammer pin from rotating, that stops any wear in the lowers pin hole. They can improve the trigger feel by eliminating any slop. Lowers can have .001-.002 slop between the two pins. KNS pins have zero movement, can make a significant improvement on how the trigger feels on some lowers. It's even more noticeable with a precision FCG.